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Over-air trials in Rennes (France)
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2.4.1.3 Over-air trials in Rennes (France)2.4.1.3.1 Static field tests at CCETTFigure 2.2 illustrates the field tests in Rennes. The user was sited in Rennes (in CCETT’s premises) and the return channel signal was transmitted, either by the rooftop antenna or from an indoor antenna, directly to the TDF St-Pern high-power broadcast television transmitting site located 30 km from CCETT. Two specific SFDMA transmission modes (modes 0 and 1) are compliant with this distance. Mode 1 is the one referred to hereafter for the measurements. St-Pern (see Fig. 2.3) is a principal transmitting site for TDF. The total transmitter power for television in the UHF/VHF bands exceeds 100 kW, with a total ERP in excess of 2 MW. The broadcasting antenna platforms are at heights of 200 m, 260 m and 270 m above ground level. On this same transmitting mast, reception of the return channel signal is achieved with a 13 dB gain antenna located at a height of 132 m. Table 2.4 gives the selected reference return channel signal parameters, and outlines the required transmitted powers that have to be delivered from the user’s transmitter, located at the CCETT, to feed the rooftop antenna on the one hand (the rejection filter that isolates the TV reception from the return channel transmission being taken into consideration in this case) and the indoor antenna on the other hand). It is important to point out that the CCETT is located on a small hill (69 m above sea level), in a “rural” environment, and therefore propagation is very close to free space. 
FIGURE 2.2 [2025-022] TABLE 2.4 Required power for the test trial in Rennes (from CCETT) for defined parameters
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